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Editorial Team
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Asked: 2026-05-28T04:04:43+00:00

Having a very odd problem. After processing of a file I read a txt

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Having a very odd problem. After processing of a file I read a txt which has three lines. Version, From Datetime, ToDatetime. I read these lines and add an object to NSCoreData. Everything works fine when running in a simulator but as soon as I deploy to my iPhone the NSDates come back as null.

Here is the console output when running from iPhone

2012-01-05 23:58:25.478 FlightPath[10257:707] 7/28/2011 12:00:00 AM
2012-01-05 23:58:27.911 FlightPath[10257:707] (null)
2012-01-05 23:58:29.718 FlightPath[10257:707] (null)

Here is the console output when running form iPhone Sim

2012-01-06 00:07:07.900 FlightPath[1755:11903] 7/28/2011 12:00:00 AM
2012-01-06 00:07:08.899 FlightPath[1755:11903] 7/28/2011 12:00:00 AM
2012-01-06 00:07:11.686 FlightPath[1755:11903] 7/28/2011 12:00:00 AM

Here is the code…I added in tDate for testing purposes. I wanted to make sure i didn’t need to add __block to the NSManagedObject.

NSString *mapInfoPath = [[mapData objectAtIndex:1] stringByAppendingPathComponent: @"Tiles/info.txt"];
        NSString *mapInfo = [[NSString alloc] initWithContentsOfFile:mapInfoPath encoding:NSUTF8StringEncoding error:nil];
        __block NSDate *tDate = nil;
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"M/d/yyyy h:mm:ss a"];

        __block int lineCount = 0;                
        [mapInfo enumerateLinesUsingBlock:^(NSString *line, BOOL *stop) {
            switch (lineCount) {
                case 1:
                    map.editionNumber = [NSNumber numberWithInt:[line intValue]];
                    break;
                case 2:   
                    tDate = [dateFormatter dateFromString:line]; 
                    map.fromDate = [dateFormatter dateFromString:line];
                    NSLog(@"%@", line);
                    NSLog(@"%@", [dateFormatter stringFromDate:map.fromDate]);
                    NSLog(@"%@", [dateFormatter stringFromDate:tDate]);
                    break;
                case 3:                            
                    map.toDate = [dateFormatter dateFromString:line];
                    break;
                default:
                    break;
            }

            lineCount += 1;
        }];
        map.processed = [NSNumber numberWithBool:YES];

Any help would be great….stuck and can’t figure out why it works on sim and not iPhone.

Thanks!

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1 Answer

  1. Editorial Team

    Appears this is a bug when phone is in 24 hour mode. The direct answer was here: http://multinc.com/2009/09/27/iphone-sdk-time-bug-for-international-users/ which I found off of this post: Why my NSDate Formatter can't convert correctly and returns null on device?

    Since I always know I’ll be parsing a 12hr date time I just used setLocale and that did the trick.

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale: [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
[dateFormatter setDateFormat:@"M/d/yyyy h:mm:ss aa"];
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